2.2Parallel Lines and Transversals
Quick Answer
When parallel lines are cut by a transversal: corresponding angles are congruent, alternate interior angles are congruent, alternate exterior angles are congruent, and co-interior angles are supplementary.
Essential Question
What angle relationships are guaranteed when a transversal cuts parallel lines, and how do we use them to find missing angle measures?
Learning Goals
- 1State the Corresponding Angles Postulate.
- 2Apply the Alternate Interior Angles Theorem.
- 3Apply the Alternate Exterior Angles Theorem.
- 4Apply the Co-Interior Angles Theorem.
- 5Find missing angle measures using parallel line theorems.
Key Vocabulary
Corresponding Angles Postulate
If two parallel lines are cut by a transversal, then corresponding angles are congruent.
Alternate Interior Angles Theorem
If two parallel lines are cut by a transversal, then alternate interior angles are congruent.
Co-Interior Angles Theorem
If two parallel lines are cut by a transversal, then co-interior angles are supplementary.
Full lesson content coming soon
Worked examples, guided practice problems, a workbook, quiz, and downloadable PDF resources will be added to this lesson in Phase 2. The learning goals and vocabulary above reflect the complete lesson scope.